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根据2007年、2008年版《中国科技期刊引证报告(核心版)》(CJCR)公布的主要学术计量指标,统计分析了我国科技期刊的自引情况。结果表明,与国外科技期刊相比,我国科技期刊的自引率相对偏高,且高影响因子和高总被引频次期刊(前20位)的自引率明显高于我国科技期刊的平均值;大学科的平均自引率相对较小,而小学科的平均自引率相对较高。影响因子的过度使用,人为因素导致了期刊的不合理自引,笔者在论证和分析前人研究成果的基础上,提出了甄别不合理自引的量化标准:当某个成熟期刊的自引率大于20%,且自引率增加或减小,影响因子就随之增加或减小,那么该种期刊就非常可能存在不合理自引的现象。并对CJCR 2007年影响因子排名前20位的期刊进行了统计分析,其中有35%(7/20)期刊符合上述情况,即可能存在不合理自引现象。
According to the major academic measurement indicators published in 2007 and 2008 edition of CJCR (China Science and Technology Journals Citation Index) (CJCR), this paper statistically analyzes the self-introduction of Chinese sci-tech periodicals. The results show that compared with foreign sci-tech periodicals, the self-citation rate of sci-tech periodicals in our country is relatively high, and the self-citation rates of high impact factors and high total citation periodicals (top 20) are obviously higher than the average ones of Chinese sci-tech periodicals. The average self-citation rate of subjects is relatively small, while the average self-citation rate of primary subjects is relatively high. The excessive use of influence factors and human factors lead to the irrational self-introduction of journals. Based on the demonstration and analysis of previous research results, the author puts forward the quantitative criteria for screening unreasonable self-citation: when the self-introduction rate of a mature journals is greater than 20%, and since the rate of increase or decrease, the impact factor will increase or decrease with it, then the journals are very likely to exist unreasonable phenomenon. The statistical analysis of the top 20 CJCR impact factors in 2007 was conducted. Among them, 35% (7/20) of the journals met the above-mentioned situation, that is, there may be an unreasonable phenomenon.